Year 2018

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GENETIC VARIABILITY AND CHARACTER ASSOCIATION OF SOYBEAN (Glycine max L. Merr.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA, BANGLADESH, 2018) HASAN, MAHMUDUL
The present research work was conducted to study the genetic diversity analysis of soybean during the period from December 2017 to May 2018 in rabi season in the experimental field of Sher-e-Bangla Agricultural University, Sher-eBangla Nagar, Dhaka. In this experiment, 22 soybean genotypes were used as experimental materials. Mean performance, variability, correlation, path analysis and genetic diversity analysis on different yield attributes and yield of soybean genotypes was estimated. Analysis of variance for each trait showed significant differences among the genotypes except pod wide, seed per pod, seed yield per plot and seed yield per hectare. In correlation study, highly significant positive association was recorded for seed yield of soybean genotypes with first flowering, days to 50% flowering, days to physiological, days to harvest maturity, plant height, number of branch per plant, number of pod per plant, seed yield per plant and yield per plot. Path coefficient analysis evidenced that 50% flowering, day to physiological maturity, plant height, number of branch per plant, pod per plant, 100 seed weight and yield per plot had the positive direct effect on yield per plant. Therefore, importance has to be given for these characters in the further breeding program to improve soybean yield. Multivariate analysis based on fifteen characters of twenty-two soybean genotypes was divided into three distant clusters. The maximum contribution of traits towards diversity was observed by first flowering, days to 50% flowering, days to physical maturity, days to harvest maturity, plant height, number of main branches per plant and pod length. As a result, these traits could be emphasized during the selection of parents for hybridization. The highest inter-cluster distance was observed between cluster I and II and the maximum intra cluster distance was found in cluster I. Considering group distance and other agro-morphogenic performance, genotypes G2 (GM0009) and G13 (GM0014) found the potential for future hybridization program in the response of increase soybean yield.
GENETIC VARIABILITY AND CHARACTER ASSOCIATION OF YIELD AND YIELD CONTRIBUTING CHARACTERS IN MAIZE (Zea mays L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, 2018) JAHAN, LABIBA
Thirty maize genotypes were studied in RCBD with three replication for the variability and character association of yield and yield related traits at Sher-eBangla Agricultural University, Dhaka during January to May, 2019. Significant variations were observed among the genotypes for all the traits studied. Among the genetic parameters, high GCV values were observed for kernels per cob 6 2 analysis and cluster III consist of highest eight genotypes. The maximum inter-cluster divergence was observed between cluster I and V
HETEROSIS AND COMBINING ABILITY IN 7×7 DIALLEL POPULATIONS OF WHITE MAIZE (Zea mays L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, 2018) AHMED, IMRAN
The study was conducted to evaluate the forty-two F 1 lines derived from 7×7 full diallel cross of white maize for yield and yield components. Seven(7) inbred lines of white maizewere mated using complete 7×7 diallel fashion during rabi season 2017-18 and then evaluated their combining ability and heterosis of forty-two hybrids over two checkvarieties BARI hybrid maize-12 and BARI hybrid maize-13 at research farm of Sher-eBangla Agricultural University, Dhaka-1207 during rabi season 2018-19. The variancesfor general combining ability (GCA) were found significant for all the characters except ear diameter, while specific combining ability (SCA) was significant for all the characters except ear height and plant height suggesting that non-additive gene action was importantfor inheritance of yield and yield related characters in the hybrid progeny. GCA varianceswere much higher in magnitude than SCA for all the characters except number of row per ear and ear diameter indicating the superiority of additive gene effects for the inheritanceof these traits. The analysis of GCA revealed that parents P7 and P4 were the best general combiner for yield related character, while parents P7 and P3 for earliness and dwarf plant ype. The analysis of SCA showed that crosses P7×P1, P1×P3, P7×P4, P6×P3, P3×P5, P4×P6, P6×P7, P5×P7, P3×P7 and P4×P5 exhibited maximum positive SCA effects for yield related character viz. ear length, ear diameter, number of row per ear, number kernel per row and hundred kernel weight and kernel yield per plant. The heterosis showed that percent heterosis for grain yield varied from -9.412% to 40.421% and -16.304 to 38.361%, considering BARI hybrid maize-12 and BARI maize hybrid-13 as check varieties respectively. Twenty crosses exhibited significant and positive heterosis over the check varieties. The highest positive heterosis showed by cross P5×P7 (40.421% and 38.361%), P3×P7 (39.50% and 37.45%), P1×P3 (37.99% and 35.97%), P5×P4 (37.81% and 35.79%), P4×P7 (36.26% and 34.26%), P6×P7 (33.10 and 31.15%), P6×P4 (32.28 and 30.34%),P1×P7 (32.19% and 30.25%) ,P4×P6 (26.39% and 24.54%) and P4×P5 (21.86 and 20.07%)over the checks BARI hybrid maize 12 and BARI hybrid maize 13, respectively. Considering the performance of SCA effects and heterosis, the crosses P5×P7, P3×P7,
CHARACTERIZATION AND COMPARATIVE ASSESSMENT OF TEN ADVANCED LINES OF AUS RICE (Oryza sativa)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA, BANGLADESH, 2018) KHANAM, ALIYA ADIBA
The present study was conducted at the experimental farm, Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka during Aus season, 2017. The experiment was carried out to characterize and compare ten advanced Aus lines (F ) based on qualitative and quantitative traits. The lines were evaluated in RCBD with three replications. Thirty five qualitative and quantitative traits were used to characterize the advanced lines. Variation was observed in the traits like leaf pubescence, shape of the ligule, attitude of the blade of flag leaf, days to heading, days to maturity, 1000-grain weight, grain length (without dehulling), sterile lemma length, decorticated grain length (after dehulling), decorticated grain shape, culm length, panicle length and no. of effective tiller per plant among the lines. Maximum no. of effective tiller was found in L10 (12.10). Minimum days to heading was found in L1, L2, L3, L4, L5, and L10. Early maturity was found in L1, L2, L3, L4, L5, and L10. 1000 grain wt. was highest in L2, L4, L6, L7, and L8. Six lines (L1, L2, L3, L4, L5, and L10) showed early time of heading, early maturing and medium type of culm length. Five lines (L2, L3, L4, L6, and L10) were observed more effective tiller per plant (more than 10). Two lines (L7, L9) were observed having long panicle (26-30 cm). Highest total no. tiller per plant, no. of effective tiller per plant, yield per plant were observed in the line L10. It was concluded that the lines L10, L5, L3 and L4 can be selected for further study.
GENETIC VARIATION AND CHARACTER ASSOCIATION IN F 5 ADVANCED POPULATIONS OF Brassica napusL.
(DEPARTMENT OF GENETICS AND PLANT BREEDING, 2018) KEYA, KANIZ FATEMA
A research was conducted by using fourty four advanced populations ofBrassica napus and grown in the experimental farm of Sher-e-Bangla Agricultural University, Dhaka to study the genetic variability, heritability, correlation and path coefficient analysis during November 2017 to February 2018. Analysis of variance revealed significant variations among the genotypes for all the traits studied. For most of the character the genotypes were found significantly variable. Phenotypic variances were comparatively higher than the genotypic variances for all the studied characters. PCV were higher than the GCV for all the characters studied. Plant height 5
HETEROSIS AND COMBINING ABILITY ANALYSIS IN INTRASPECIFIC HYBRIDS OF LOCAL AND EXOTIC TOMATO (Solanum lycopersicum L.) GENOTYPES
(DEPARTMENT OF GENETICS AND PLANT BREEDING, 2018) SIDDIKY, SAIFUL ISLAM
The present study was conducted in order to estimate heterosis and combining ability in intraspecific hybrids of some tomato genotypes at Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh, during the period of November, 2017 to March, 2018. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications which included six tomato genotypes viz. G1 (SAU tomato 1), G2 (SAU tomato 2), G3 (SL001), G4 (SL002), G5 (BARI Tomato 2) and G6 (SL 003). Data was collected and analyzed for 10 characters viz. days to first flowering, days to 50% flowering, plant height at 50% flowering, number of cluster per plant, number of fruit per cluster, number of fruits per plant, fruit length, individual fruit weight, fruit diameter and locule number per plant. Seedlings of 31 days old were transplanted to main field. G2 showed significant negative GCA for days to 1 st and 50% flowering and significant positive heterosis for number of fruits per plant. In case of hybrids, the lowest days required for 1 st flowering was observed in G2XG6 and 50% flowering in G6XG5. Highest number of fruits was observed in G2XG6 and G3XG5 showed the lowest number of fruits per plant. G2XG3, G2XG4, G2XG5 and G2XG6 showed significant higher number of fruits per plant over better parent. In case of days to first flowering G1XG4, G2XG4, G2XG4, G4XG2, G5XG4 and G6XG4 showed significant negative heterosis over better parent and G2XG3, G2XG4 and G4XG2 showed significant negative heterosis over mid parent. G4XG1 and G6XG1 showed significant positive SCA for plant height at 50% flowering. G2 showed significant positive SCA for most of the characters both cased as female or male parent.
HETEROSIS AND COMBINING ABILITY ANALYSIS IN Brassica rapa L.
(DEPARTMENT OF GENETICS AND PLANT BREEDING, 2018) FERDOUS, JUBAIDA
Field experiment on rapeseed (Brassica rapa L.) involving 7 x 7 full diallel cross including reciprocal were conducted at the Sher-e-Bangla Agricultural University, Dhaka during the winter season of 2018-2019. Heterosis and Combining ability were estimated for seed yield and other related characters such as plant height, days to 50% flowering, days to maturity, no. of primary branches per plant, no. of siliqua per plant, no. of seeds per siliqua, length of siliqua and hundred seed weight per plant. Out of forty-one crosses, the hybrid SAU proposed 4 ×BARI Sar-15 was found to be the best for number of primary branches per plant. While the cross BARI Sar-6 × Local Tori-7 produced maximum number of secondary branches per plant. The cross BARI Sar-6 × Local Tori-7 produced maximum number of siliqua per plant. maximum length of siliqua was found in SAU proposed 4 × BARI Sar-6 whereas BARI Sar-17×BARI Sar-14 produced the highest number of seeds per siliqua. The highest seed yield was also observed in the hybrid Local Tori-7×Yellow Special. Highly significant positive heterosis was found in the cross SAU proposed 4 × BARI Sar-17 over better parent and in SAU proposed 4 ×BARI Sar-15 over mid parent for plant height. The hybrid SAU proposed 4 ×Yellow Special was found to have the best heterotic effect for number of primary branches per plant. Highest significant positive heterosis for number of secondary branches per plant and for number of silique per plant over better parent as well as mid parent was found in BARI Sar-6 × Local Tori-7. Significant negative heterosis over mid parent and better parent was found in SAU proposed 4 and thus these can be used for producing variety with earliness. Highly significant and positive value for both mid parent and better parent was represented by Local Tori-7 × Yellow Special. The variance due to GCA and SCA were highly significant for all the characters studied. The parent BARI Sar-17 was an excellent general combiner for dwarfness. For number of secondary branches, Seed yield per plant and the number of siliqua highly significant and positive GCA effects were observed in Local Tori-7. BARI Sar-17 exhibited the highest significant and positive GCA effects for seed per silique and can be considered as a good general combiner. Yellow Special × SAU proposed 4 was the best specific combiner for dwarfness where as Local Tori-7 × BARI Sar-17 for primary branches per plant and Local Tori-7 × BARI Sar-15 siliqua per plant. Yellow Special × BARI Sar-14 was the best specific combiner for seed yield per plant and SAU proposed 4 ×Local Tori-7 for seeds per siliqua.The GCA and SCA ratio for all the characters except seed yield per plant were more than one indicating that these characters were predominantly under additive genetic control.
GENETIC EVALUATION OF BORO RICE (Oryza sativa L.) UNDER IRRIGATED AND RAINFED CONDITION
(DEPARTMENT OF GENETICS AND PLANT BREEDING, 2018) JOMADDER, MD. NAYEEM
Drought is a major abiotic constraint for growing rain-fed rice in Bangladesh. A set of twenty rice genotypes including local boro rice genotypes viz., Poshusail, Gorchihail, Birion, Soilerpuna, Pankaich, Gopal Deshi, Borail were evaluated under irrigated and rainfed condition at farm of the Sher-e- Bangla Agricultural University, Dhaka-1207 during December 2018 – May 2019. Ten morphological characters viz, plant height (cm), flag leaf length (cm), flag leaf width (cm), number of primary branches per panicle, number of secondary branches per panicle, panicle length (cm), number of filled grain per panicle, number of unfilled grain per panicle, thousand seed weight (g) and yield (ton/ha) were recorded. Analysis of variance revealed highly significant variation among the genotypes for all the characters under study in both conditions (irrigated and rainfed). The effects of water deficit on various morphological traits associated with drought tolerance were also studied. Result revealed that significant yield decline was observed almost in all rice genotypes grown under rainfed condition compared to normal irrigated situation. Out of twenty rice genotypes, BRRI dhan36, BRRI dhan59, BRRI dhan55 showed superior performance in terms of grain yield and yield attributes under normal irrigated condition. Under rainfed condition, the genotypes namely BRRI dhan55, Gopal Deshi, Soilerpuna showed superior performance in terms of grain yield and yield attributes. Significant variation was also observed among the genotypes for plant height, flag leaf length (cm), flag leaf width (cm), number of primary branches per panicle, number of secondary branches per panicle, panicle length (cm), number of filled grain per panicle, number of unfilled grain per panicle, thousand seed weight (g) and yield (ton/ha) and drought tolerance index under both normal (irrigated) and rainfed condition. The present study also indicated the agro-morphological traits had direct and indirect effect on yield performance of rice genotypes under rainfed condition at reproductive stage.
GENETIC VARIABILITY, CHARACTER ASSOCIATION AND PATH ANALYSIS IN F 3 SHORT STATURE POPULATIONS OF WHITE MAIZE (Zea mays L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) SHOMPA, BODRUN NESSA
The investigation was carried out with 24 F 3 white maize populations to study the genetic variability, character association and finally to select the short duration and dwarf promising populations based on yield and yield contributing traits at Sher-e-Bangla Agricultural University, Dhaka during November 2017 to March 2018. Significant variations were observed among the F 3 populations for all the traits studied. The F 3 population of KS-510-F 3 -S 2 showed the maximum mean performance in plant height (220.61 cm), cob length (19.65 cm), number of grains per row (33.83), while the population of Youngnuo-7F 3 -S 1 showed the minimum mean performance in plant height (122.33 cm), cob height (53.00 cm), base diameter (6.10 cm). The population PSC-121-F 3- showed the maximum yield per plant (97.67), while Youngnuo-7-F 3 showed the minimum yield per plant (46.94). In analysis of different genetic parameters the highest genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) values were observed for cob height (20.99, 21.55), leaf blade area (19.20, 20.31), yield per plant (19.04, 22.59). High heritability coupled with high genetic advances in percent mean were obtained for plant height, cob height, number of cob bearing node, leaf blade area, number of grains per row and yield per plant. Correlation studies revealed that yield per plant positively and significantly associated with plant height, base diameter, number of leaves per plant, cob length, cob diameter and number of grains per row at both genotypic and phenotypic levels. Path coefficient analysis indicated positive direct contribution towards yield per plant through plant height, base diameter, branches of tassel, leaf blade area, cob length, cob diameter, number of rows per cob, number of grains per row and 100 grain weight. Based upon the mean performance among the 24 F 3 -S 1 segregating population, PSC-121-F 3 and KS-510-F 3 -S 1 would be selected for high grain yield per plant. Again Youngnuo-7-F 3 -S 2 and Changnuo-1-F 3 -S 1 might be selected as promising for both of the traits short duration and dwarf plant stature. S 2 -S 2
INTERACTION EFFECT OF GENOTYPE AND SALINITY LEVELS ON AGROMORPHOGENIC, PHYSIOLOGICAL AND NUTRITIONAL TRAITS OF TOMATILLO (Physalis ixocarpa Brot./P. philadelphica Lam.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) NARZIS, NABILA
The present study was conducted as a pot experiment in order to observe the performance of tomatillo (Physalis ixocarpa Brot./P. philadelphica Lam.) genotypes under different levels of salinity treatment. The experiment was conducted beside the area of the net house of Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh, during the period of November, 2017 to March, 2018. A two factorial Completely Randomized Design (CRD) experiment was conducted which included four tomatillo genotypes (Factor A) viz. G 1 (SAU tomatillo 1), G 2 (SAU tomatillo 2), G 3 (PI003), G 4 (PI004) and three salinity treatments (Factor B) viz. T 1 (Control), T 2 (8 dS/m), T 3 (12 dS/m) and was outlined with three replications. Seedlings of 21 days old were transplanted into main plastic pots and two salinity treatments, 8 dS/m and 12 dS/m were started to apply after 7 days of transplanting. The observed results showed that both of four tomatillo genotypes and three salinity treatments had their independent significant influence and also had significant influence in their interaction effect between different agromorphogenic, physiological and nutritional traits. Almost all agromorphogenic and physiological traits responded negatively (%Reduction), except endogenous Na ion and proline content whereas nutritional traits like, %Brix, titratable acid and vitamin-C content, except fruit pH responded positively (%Increase) under the increased level of salinity treatments. From the observed results of the accomplished study, considering yield and its contributing characters like, number of fruits per plant, average fruit length, diameter, fruit weight as well as yield per plant, the best salt tolerant genotypes of tomatillo were genotype G 1 and G 3 under both slightly and moderately salinity stresses. These two also showed minimum endogenous Na and maximum K + ion content along with minimum reduction in leaf area index. The maximum amount of proline content was observed in genotype G 4 while G 1 showed the maximum increase percentage. The maximum reduction in days to maturity was found in genotype G 1 and G 4 . Considering the increased percentage of nutritional traits like, %Brix, titratable acid and vitamin-C content, the best salt tolerant genotypes of tomatillo were genotype G 3 along with G 4 and G 1 + . Thus, genotype G 3 and G 1 could be recommended for further trial in Southern region of Bangladesh. And, genotype G 2 and G 4 could be served as parent materials for further hybridization or genetic transformation program along with G 3 and G 1 . +
GENETIC DIVERSITY, CORRELATION AND PATH CO-EFFICIENT ANALYSIS OF WHITE MAIZE (Zea mays L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) ROY, GOUTOM
Seventeen white maize inbreed lines were collected from CIMMYT, Mexico and Bangladesh and laid out in Randomized Complete Block Design (RCBD) with three replications in the experimental farm of Sher-e-Bangla Agricultural University, Dhaka during October, 2016 to April, 2017. Mean performance, variability, correlation matrix and path analysis on different yield contributing characters and yield of maize inbreed line were calculated. The mean performance of the maize inbreed lines showed that the maximum grain yield/plant (170.01 g) was recorded in the genotype of CLTHW15008, whereas the minimum grain yield/plant (44.52 g) was recorded in CLTHW15007. The phenotypic co-efficient of variation was higher than the genotypic co-efficient of variation for all the yield contributing traits. In correlation study, significant positive association was recorded for grain yield/plant with base diameter of plant (1.00), leaf breadth (1.00), cob length (0.979), cob diameter (0.930), number of row per cob (0.979), number of grain per row (0.999), 100-grain weight (0.992). Path analysis revealed that plant height (0.412), leaf breadth (0.073), days to 50% flowering (0.280), number of rows per cob (0.462), number of grain per row (0.209) had positive direct effect on yield/plant. Base to cob distance (-0.214), base diameter (-0.614), leaf length (-0.467), days to maturity (-0.262), cob length (-0.725), cob diameter (-0.355), 100-grain weight (-0.472) had negative direct effect on grain yield. In diversity analysis the clustering pattern denoted that, cluster II was the largest cluster comprising of 6 genotypes and cluster III belonged to 4 genotypes of maize. The maximum inter-cluster divergence was observed between cluster I and V (58.22) followed by cluster I and III (48.35). Considering diversity pattern, genetic variability and other agronomic performance CLTHW15008 from cluster I; CLTHW15004, CLTHW15005, CLTHW15006, CLTHW15015 from cluster II might be considered as potential parents for hybridization program for further improvement of the crop.
GENOTYPE AND ENVIRONMENT INTERACTIONS IN YIELD CONTRIBUTING CHARACTERS OF MUSTARD (Brassica rapa L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) MONDAL, SUSMITA
The experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka during October, 2017 to April, 2018. The objective of this study was to assess the genotype and environment interactions for yield and yield contributing characters of mustard varieties grown in Bangladesh through the AMMI (additive main effects and multiplicative interaction) model. The study comprised of eleven (11) mustard varieties of Brassica rapa released by BARI and BINA and three (3) environments laid out in randomized complete block (RCBD) design with three replications. The environments were three sowing times viz., optimum (Env-1), late (Env-2) and very late (Env-3) sowings of eleven mustard varieties. The results of combined analysis of variance (ANOVA) revealed significant differences between genotypes and environments as main effects. Genotype and environment interactions both linear and non-linear components were highly significant for most of the parameters except number of seeds per siliqua and hundred seed weight. The results also suggested that Env-3 was poor and Env-1 and Env-2 were found rich and favorable for mustard production. The IPCA1 (First Interaction Principal Component Axis) scores of a genotypes in the AMMI analysis used as an indication of the stability or adaptation over environments. The greater the IPCA1 scores indicated the better adaptation of a genotype to certain environments. Hence, considering the IPCA1 scores BARI Sharisha-9, BARI Sharisha-15, Maghi and Improved Tori were low yielding and unstable, while BARI Sharisha-6, BARI Sharisha-17 and BINA Sharisha-9 were shown high yielding but unstable genotypes. Again, Env-1 was found as rich environment where, BARI Sharisha-17, BINA Sharisha-9 were shown highly responsive to the environment (Env-1). BARI Sharisha-12 was found intermediate yielding and stable variety. As a whole, Sonali Sharisha-75 and BINA Sharisha-10 were found as high yielding and stable varieties and Env-1 and Env-2 were more favorable for the mustard production.
GENETIC DIVERSITY AND CHARACTERS ASSOCIATION ANALYSIS OF ADVANCED LINE OF Brassica napus L.
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) KHATUN, AZIZA
A field experiment was conducted with 26 BC₁F 6 genotypes of Brassica napus L. at the experimental field of Sher-e-Bangla Agricultural University, Dhaka to study the Genetic diversity and characters association analysis of advanced line of Brassica napus during November 2017 to March 2018. The populations were found significantly variable for all the characters. Comparatively phenotypic variances were higher than the genotypic variances for all the characters studied. PCV was higher than the corresponding genotypic coefficient of variation (GCV) for all the traits studied. Higher estimates of PCV than GCV were observed for all the traits. PCV ranged from 1.32% for Days to maturity to 28.46% for Secondary branches per plant and GCV from 0.95% (Days to maturity) to 17.88% (seed yield per plant) The high PCV value was observed for number of secondary branches per plant (28.46%), siliqua per plant (15.43%), 1000 seed weight (13.39%). Seed yield per plant showed high broad base heritability (61.07). The significant positive correlation with seed yield per plant was found with days to flowering (0.319 and 0.070) and siliqua length (0.068 and 0.015). Path coefficient analysis revealed that days to flowering (1.180), plant height (0.009), secondary branches per plant(0.210), number of siliqua per plant (0.493), siliqua length (0.498) and seeds per siliqua (0.005) had the positive direct effect on yield per plant. By genetic divergence analysis Eigen values of principal component axes of coordination of genotypes with the first axes totally accounted for the variation among the genotypes (29.70%) and three PCA account for (61.00%) of the total variation The genotypes were grouped into five clusters. Cluster II contained the large no. of genotypes (11) and cluster III contained only one (1). The cluster V had higher intra cluster distance (2.44) that indicates the highest amount of genetic divergence within the group. The maximum inter cluster distance was observed between genotypes of cluster III and IV (16.453) followed by clusters II and III (11.693). Under cluster III genotypes possessed early maturity, highest plant height, more primary and secondary branches per plant, more siliqua per plant and short siliqua. Considering group distance and other agronomic performance genotypes G1, G2, G13, G15, G18, G19, G21 and G24 might be suggested for future hybridization program.
GENETIC DIVERSITY ANALYSIS OF SWEET POTATO (Ipomoea batatas (L.) Lam.) BASED ON YIELD AND QUALITY TRAITS
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) RAHMAN, TANJINA
An experiment conducted to study the genetic variability analysis based on different yield contributing and quality traits of sweet potato genotypes in Sher-E-Bangla Agricultural University, Dhaka-1207, Bangladesh during Rabi season
SCREENING OF WHEAT (Triticum aestivum L.) GENOTYPES FOR DROUGHT TOLERANCE USING COMBINATION OF MORPHO- PHYSIOLOGICAL AND BIOCHEMICAL TRAITS
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) RAHMAN, ATIKUR
The experiment was conducted during the period from November 2017 to April 2018 in rabi season in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka to unravel the role of morpho-physiological and biochemical characters in spring wheat under drought stress. Twenty diverse genotypes including 16 lines from the Wheat Research Center (BARI)’s heat and drought nurseries, and four local checks were evaluated under ﬁeld conditions. Mean performance, genetic parameters, Pearson’s correlation coefﬁcient, and principal component biplot analysis were calculated. The longest plant (84.20 cm) was recorded in genotype Shatabdi, while the shortest plant (63.96 cm) was found in wheat genotype BARI GOM-30. The highest grain yield per plant (5.57 g) was recorded in Prodip, while the lowest grain yield per plant (4.15 g) was observed in the wheat genotype SAWYT-312. Phenotypic coefficient of variation was higher than the genotypic coefficient of variation for all the yield contributing traits. In correlation study, significant negative association was recorded for grain yield per plant of wheat genotypes with days to 50% of heading (-0.397), while the non-significant negative association for number of grains/spike (-0.183), chlorophyll content (-0.097), dry matter content (-0.003) and root length (-0.058). On the other hand, significant positive association was recorded for grain yield per plant with plant height (0.688), number of spike/m 2 (0.269), number of spikelet’s/spike (0.630), peduncle length (0.640) and weight of 1000 grains (0.201), while non-significant positive association was observed with leaf area index (0.007). The positive correlation observed between grain yield and proline content under-drought stress conditions provides evidence that proline accumulation might ultimately be considered as a tool for effective selection of drought tolerant genotypes. The study selected 8 genotypes with high grain yields under drought stressed conditions and favorable adaptive traits useful for breeding. In consideration of yield contributing characters and yield Prodip performed better under drought condition followed by DTWYT-22, SAWYT-326, SAWYT-331, Shatabdi, BARI Gom-28, and BARI Gom-30. The proline content hight found in SAWYT-312 (220.2), and also found in SAWYT-303 (194.74), SAWYT-345(178.53) and lowest in SAWYT-324(46.16). Key words: wheat, drought, physiology, biochemical
GENETIC ANALYSIS IN YIELD AND ITS CONTRIBUTING CHARACTERS IN F₅ POPULATION OF Brassica napus L.
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) BHUIYAN, FARZANA ALAM
Thirty two F 5 population of Brassica napus L. were evaluated. The experiment was laid to study the variability, correlation, path analysis and genetic diversity. The genotypes were found significantly variable for most of the characters. Phenotypic variances were higher than the genotypic variances for most of the character studied. The high GCV value was observed for number of secondary branches per plant (43.11). Number of secondary branches (98.67) exhibited the highest value of heritability followed by seed yield per plant (98. 43) while days to maturity (88.23) exhibited the lowest value of heritability. The significant positive correlation with seed yield per plant were found with all most all the characters except days to 50% flowering (0.034) and days to maturity (-0.095). Path co-efficient analysis revealed that days to 50% flowering, number of secondary branch, number of siliqua per plant, number of seed per siliqua, and thousand seed weight had the positive direct effect on yield per plant whereas days to 80% maturity, plant height, number of primary branch and siliqua length had the negative direct effect on yield per plant. On the basis of cluster analysis, all the genotypes were classified in five clusters.The highest inter cluster distance was observed between cluster I and IV(10.311). The lowest intercluster distance (3.513) was observed between the cluster III and IV (3.521). Considering group distance and other agronomic performance genotypes Nap-248 X Nap-159, Nap-2037 X Nap-2057, Np-9908 X Np-2022, Nap-2012 X Nap-2022, Bs13 X Nap-2022 and Bs-7 X Nap-206 might be suggested for future breeding program.
GENETIC STUDY ON YIELD AND QUALITY TRAITS OF ADVANCED BREEDING POPULATIONS IN Brassica rapa L.
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) KARMOKAR, DEBOSREE
The experiment was conducted with 13 advanced breeding populations of Brassica rapa L. during rabi season from November 2017 to February 2018 in research farm of Sher-e-Bangla Agricultural University to evaluate morphological and biochemical traits of the selected populations. The analysis of variance showed significant variation in all the traits. High genotypic and phenotypic coefficient of variation was observed for the characters viz; number of secondary branches per plant, number of siliquae per plant and yield per plant. High heritability coupled with high genetic advance in percent of mean was found for days to 50% flowering, number of secondary branches per plant, siliqua per plant, number of seeds per siliqua and yield per plant. The correlation studies revealed that yield per plant had highly significant positive relation with number of primary branches per plant, secondary branches per plant and number of siliquae per plant at both genotypic and phenotypic level. Path analysis showed that siliquae per plant had highly significant and positive direct effect on the yield per plant. Biochemical analysis of various fatty acids of five populations was done. Among the populations lowest amount of palmitic, stearic and erucic acid was found in P7 (Tori-7 x BARI sarisha-15 F 6 ) (1.68%), P9 (BARI sarisha-9 X BARI sarisha-6 S 5 ) (0.49%) and P12 (SAU sarisha-1 X BARI sarisha-15 F 6 ) (54.08%) respectively. The highest amount of oleic, linoleic and linolenic acid was found in P12 (15.16%), P13 (BARI sarisha-6 X BARI sarisha-15 F 9 ) (14.27%) and P13 (8.65%) respectively. In case of short duration P1 (SAU sarisha-2 X BARI sarisha-15 F 7 ) (78.00 days) showed the best result. Higher yield per plant was found in P1 (7.31 g), P9 (6.53 g) and P12 (5.40 g) chronologically. Among the populations P1 was found as the best on the basis of days to 80% maturity, number of secondary branches per plant, number of siliquae per plant and yield per plant. Based on biochemical analysis for saturated fatty acids populations P7 and P9 were good. For unsaturated fatty acids population P12 was better enough than other populations. By comparing, it might be concluded that populations P1, P7, P9 and P12 had potential for improvement based on yield contributing traits and fatty acid content. F 15
GENOTYPE × STRESS INTERACTION UNDER SALINITY AND DROUGHT CONDITION IN TOMATO (Solanum lycopersicum L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) SIDDIQUE, ABU BAKAR
This study was conducted to investigate the genotype and stress interaction under salinity and drought condition. The experiments were conducted in net house of Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University from November 2018 to March 2019. Two independent experiments were conducted with eight tomato genotypes collected from Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University. The genotypes were SL 021 (G ), SL 022 (G 2 ), SL 023 (G 3 ), SL 024 (G XVII 4 ), SL 025 (G 5 ), SL 026 (G 6 ), SL 027 (G ) and BARI tomato 11 (G 8 ). Four salinity treatments viz. T 1 (control), T (4 dS/m, mild salinity), T 3 (8 dS/m, moderate salinity), T (12 dS/m, severe salinity) and four drought treatments viz. T 1 (control), T 2 4 (10 days withhold of water, mild drought), T (20 days withhold of water, moderate drought), T (30 days withhold of water, severe drought) were applied to the genotypes. Completely Randomized Design (CRD) with three replications was followed in both experiments. Genotypes, salinity and drought influenced singly and in interaction on agromorphogenic, physiological and nutritional traits of tomato. Salinity treatment affected almost all traits of tomato negatively except days to first fruit setting, days to maturity, dry matter content, Na+ uptake, Brix content, titrable acidity and vitamin C content. Drought treatment interacted negatively with all traits except days to first flowering, days to fruit setting, days to maturity, proline content, etc. Early flowering (22.67 DAT) and early maturity (65 DAT) was found in G 8 4 at moderate and severe salinity respectively. G showed higher number of cluster per plant, number of flower per cluster, number of fruit per cluster and number of fruit per plant in both mild to moderate salinity and drought treatment. G 8 showed higher average fruit weight and higher yield per plant in both mild to moderate salinity and drought treatments. G 5 showed lower Na + uptake and higher K + uptake in severe saline treatment and higher Membrane stability index at moderate drought treatments. G also showed higher increase of proline and vitamin C content with the increase of drought treatment. From the research findings, G 5 could be suggested for early flowering, early fruit setting, early maturity, higher dry matter content and highest lycopene content at mild to moderate saline prone area. G 8 could be suggested for higher number of clusters per plant, fruits per cluster and higher number of fruits per plant for moderate saline and drought prone area. G 4 8 could be suggested for higher fruit weight, higher yield per plant for mild to moderate drought and saline area. G could be considered for the cultivation at mild to moderate saline condition for its lower Na + uptake, higher K + uptake and higher vitamin C content. These genotypes viz. G 4 , G 5 and G could also be utilized as parental material for future hybridization program for these specific traits at specific stress prone area of Bangladesh.
CHARACTER ASSOCIATION AND GENETIC DIVERSITY ANALYSIS IN POTATO (Solanum tuberosum L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) HASAN, MD. MAHADY
The experiment was conducted with twenty genotypes of potato at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka during the period from November2017 to March 2018 to estimate the genetic variability, correlation and diversity among the twenty (20) genotypes of potato. The experiment was conducted using Randomized Complete Block Design with three replications. All the twenty (20) genotypes varied significantly with each other for all the studied characters indicated the presence of considerable variations among the genotypes studied. The phenotypic co-efficient of variation ( PCV) values were higher than the respective genotypic coefficient of variation (GCV) values for all the characters under study. No of Secondary branches per plant, leaf breadth, no. of tuber per plant, individual weight of tuber, tuber yield per plant and yield (ton/ha) showed high heritability along with high genetic advance as percentage of mean were normally more helpful in predicting the genetic gain under selection. From the correlation analysis it was revealed that yield per ha was significantly positively correlated with secondary branches per plant, tuber per plant, individual tuber weight and tuber yield per plant at both genotypic and phenotypic levels suggesting that the selection for these traits would helpful for the improvement of yield per ha. As per principal component analysis (PCA), D and clusters analysis the genotypes were grouped into five different clusters. Clusters V had the maximum nine and cluster II and IV had the minimum one genotype. The highest inter-cluster distance was observed between II and IV and the lowest was observed between I and V. Genotypes in cluster II showed maximum performance for yield per ha, tuber yield per plant, individual tuber weight, tuber number per plant, tuber breadth, no of secondary branches per plant and plant height. Cluster III showed maximum performance for no of primary branches per plant and tuber length. Cluster V showed highest value for leaf length and leaf breadth. Considering this idea and other characteristic performances, genotype G19 (BARI Alu-46) from cluster II; genotype G18 (BARI Alu-41) and G2 (BARI Alu-49) from cluster I and G12 (BARI Alu-24) from cluster IV might be considered to suggest farmer for cultivation for better yield as well as use as parent for efficient hybridization programme for further improvement. 2
GENETIC VARIABILITY STUDIES OF GREEN CHILLI (Capsicam frutensences L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) KABIRAJ, ANTARA
In order to evaluate the variability and genetic diversity of chilli the present experiment was carried out during the period from November 2017 to April 2018 at the experimental farm of the Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka. It was involved with 28 genotypes of chilli of different origin/sources. The experiment was laid out in Randomized Complete Block Design